Contraband Blackout (1940)
This was an okay spy film with a fun plot that is obscured by the 70% of the movie spent in almost total darkness and Conrad Veidt not being the bad guy. Captain Anderson certainly tried but Cesare kept coming through.
A modern remake would be fun but a lot of the context would be lost, naturally. It’s funny for a movie called Contraband about a sea captain to be set mostly in London. The US title of this movie is part explanation for the audience and part joke about it being literally a blackout.
It is definitely a spy movie. It is definitely not about contraband. It is definitely a great story but not that great of a movie.
p.s. The nods to Lang and Mata Hari were noted.